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Daily Winter Weather Report

Date: Tuesday - March 01, 2011

Station Max Temp Min Temp Pres Temp New Snow Depth Sky Present Conditions
Canyon 21 10 18 T 46 OC 5-10mph
East Entrance 28 19 27 0 40 OC W@5mph
Grant Village 22 13 20 0 53 OC Calm
Lake 22 5 21 0 48 OC Calm
Lamar 26 19 26 0 23 OC Calm
Madison 23 6 20 0 35 OC Calm
Mammoth 29 21 29 0 18 OC SW@7-9mph
Old Faithful 24 16 24 0 37 OC SW@8-11mph
Pahaska 29 24 28 0 44 OC Calm
Snake River 29 16 28 0 54 BC W@1-5mph
Soda Butte 26 19 26 0 24 SC Calm
Thumb Divide 24 20 24 T 57 OC Calm
Tower 30 14 24 0 31 OC SW@10-12mph
West Entrance 24 23 15 0 48 OC Breezy
T=Trace / BC=Broken Clouds / OC=Overcast / SC=Scattered Clouds
All Temperatures are in °F ~ All Snow Depths are in Inches

* * * Road Conditions * * *
Road Section Status Conditions Public Access / Info
Gardiner to Mammoth YR Good STR
Mammoth to Tower YR Good STR
Tower to NE Entrance YR Fair STR
Beartooth Highway CLOSED * CLOSED * CLOSED *
Canyon to Lake Open Fair Oversnow
Firehole Canyon Drive Open - Oversnow - Snowcoaches only in the morning
Grant to South Entrance Open Good Oversnow
Junction to Chief Joseph Hwy CLOSED * CLOSED * CLOSED *
Lake to East Entrance Open Fair Oversnow
Lake to West Thumb Open Fair Oversnow
Madison to Old Faithful Open Good Oversnow
Madison to West Yellowstone Open Good Oversnow
Mammoth to Norris Open Fair Oversnow
Norris to Canyon Open Fair Oversnow
Norris to Madison Open Good Oversnow
Old Faithful to Grant Open Good Oversnow

YR=Year Round / NR=No Restrictions / STA=Snow Tires Advised / STR=Snow Tires Required


# Poor road conditions - bare spots and melting snow - Restricted to Snowcoaches Only.

The park service plowing schedule for roads for the spring season.

******** FOR CURRENT ROAD INFORMATION PLEASE CALL 307-344-2117 ********


Yellowstone Seven Day Forecast on March 01, 2011
by the National Weather Service Riverton, WY

Today...Breezy. Cloudy with a 40 percent chance of snow. Highs 27°F to 33°F. Southwest winds 15 to 25 mph.

Tonight...Breezy. Partly cloudy. Chance of snow in the evening... Then slight chance of snow after midnight. Lows 9°F to 15°F. Southwest winds 15 to 20 mph. Chance of snow 30 percent.

Wednesday...Breezy. Mostly cloudy. Slight chance of snow in the morning...then chance of snow in the afternoon. Areas of blowing snow in the afternoon. Highs 32°F to 38°F. Southwest winds 15 to 25 mph. Chance of snow 40 percent.

Wednesday Night...Breezy. Cloudy with a 50 percent chance of snow. Lows 16°F to 22°F. Southwest winds 15 to 25 mph.

Thursday...Cloudy with a 50 percent chance of snow. Highs 28°F to 34°F. Southwest winds around 15 mph.

Thursday Night...Cloudy with a 50 percent chance of snow. Lows 10°F to 16°F.

Friday...Cloudy with a 50 percent chance of snow. Highs 25°F to 31°F.

Friday Night...Mostly cloudy with a 20 percent chance of snow. Lows 6°F to 12°F.

Saturday...Mostly cloudy with a 40 percent chance of snow. Highs 26°F to 32°F.

Saturday Night...Cloudy with a 50 percent chance of snow. Lows 11°F to 17°F.

Sunday...Cloudy with a 50 percent chance of snow. Highs 25°F to 31°F.

Sunday Night...Colder. Mostly cloudy with a 30 percent chance of snow. Lows 4°F to 10°F.

Monday...Mostly cloudy with a 20 percent chance of snow. Highs 22°F to 28°F.

Snowflake Hazardous Weather Snowflake Gibbon Falls Forecast Snowflake Mammoth Forecast Snowflake Midway Forecast Snowflake Norris Forecast Snowflake Old Faithful Forecast Snowflake

* * * Snow Depth Totals as reported at SNOTELs * * *
Station Depth (inches) Station Depth (inches)
Black Bear 112 Parker Peak 82
Blackwater 65 Snake River Station -
Canyon 50 Sylvan Lake 63
Evening Star 80 Sylvan Road 48
Fisher Creek 100 Thumb Divide 57
Grassy Lake 94 Two Ocean Plateau -
Lewis Lake Divide 88 West Yellowstone 46
Madison Plateau 76 Whiskey Creek 57
Northeast Entrance 41 Wolverine 39

Avalanche Information
from the Gallatin National Forest Avalanche Center - March 01, 2011 - this report is by Doug Chabot. This advisory does not apply to operating ski areas.

Mountain Weather

Since yesterday morning two inches of snow fell from Big Sky to West Yellowstone with Cooke City getting four inches. Mountain temperatures are in the upper teens, just a few degrees colder than yesterday's high. Wind is the weather story. West to southwest winds started blowing yesterday morning and are averaging 25 mph with gusts to 68 mph. Mid slope anemometers are showing winds raking all elevations. These speeds will decrease to 20-30 mph later this morning. In the next 24 hours, under mostly cloudy skies mountain temperatures will climb only a few degrees with little chance of snowfall.

Snowpack and Avalanche Discussion:

The Bridger, Madison and Gallatin Ranges and the Lionhead area near West Yellowstone:

It's going to be difficult to find slopes not affected by the wind. Many are scoured, some are drifted with shallow pockets and a few have meaty wind-loads. With wind speeds reaching over 60 mph, even pock marked, scoured surfaces will get further eroded. The strongest winds were at the ridgetops, but mid elevation slopes were not spared with snow being cross loaded into gullies. Mark took a long tour in the Spanish Peaks on Sunday and found most snow glued down and not moving. Without a widespread weak layer, the stability issue is confined to wind affected slopes where it's still possible to trigger an avalanche. Recent winds also helped add a few feet of growth to the cornices at the ridgetops. Cornices are scary because they break further back than expected, plus they are big triggers. Each six foot tall by three feet deep by three feet wide section of snow weighs about 2,000 pounds, so a 12 foot long cornice is an 8,000 pound (4 ton) trigger. Weak layers are relative, so even in a strong snowpack a big trigger can sometimes create an avalanche.

For today, the Avalanche Danger is rated MODERATE on any slope wind-loaded as well as any slope steeper than 35 degrees. Lower angled, non-wind-loaded terrain has a LOW Avalanche Danger.

The mountains around Cooke City and the Washburn Range:

The mountains outside Cooke City got four inches of snow yesterday with strong winds. My partner and I had a beautiful, calm, sunny day on Sunday, only to have blizzard conditions at the passes yesterday morning. I'm not instrument rated on my snowmobile so navigation was limited to the groomed trail. Snow was blowing and loading slopes at all elevations. On Sunday we saw an avalanche on Abundance and Sheep mountains caused by cornice falls. We also investigated a small skier triggered slide near Round Lake on a wind-loaded rollover. My primary avalanche concern is on wind-loaded slopes. I do not expect avalanches to break deep. Instead I'm concerned with slabs formed in the last 24 to 36 hours which will be the most likely to fracture.

For today, all wind-loaded terrain has a CONSIDERABLE Avalanche Danger. Slopes mercifully spared the wind will have MODERATE Avalanche Danger if they are steeper than 35 degrees and LOW on less steep.


1. We've recently uploaded more photos and snowpits to our web site, more than what are linked in the advisory.

2. We're creating a series of "How To…" stability test videos. So far we've got clips on performing a CT and ECT. There are located under Stability Tests on the Resources page.

3. The results from our survey are posted online. Thanks to all who participated. You can check out the results at

In response to our survey we added a new page to the website with images of our snowpit profiles. This page is under the Resources/Other Info tab at

Information provided by Doug Chabot, Mark Staples, and Eric Knoff from the Gallatin National Forest Avalanche Center. For Photos and Videos, please visit the Avalanche Centers Website!

If you have any snowpack or avalanche observations, drop them a line at or call: 406-587-6984.

For detailed Avalanche Terms utilized here, please see the Avalanche Glossary.

Upcoming Events

TONIGHT - 3rd Annual Montana Ale Works Fundraiser

When & Where: March 1, Tuesday at 6:00 p.m. in the Railcar.

Cost: $20 to benefit the Friends of the Avalanche Center

Details: Chef Roth at Montana Ale Works is creating tapas style servings that will be paired with select beer from Lone Peak Brewery. More information HERE.

SATURDAY - Pinhead Classic

The 30th Annual Pinhead Classic on is Saturday, March 5th. "Gangsters and Flappers" is this year's costume theme, so come dressed up to race, socialize and wind great prizes. Registration is $30 but get you all sorts of cool stuff. All proceeds benefit the Friends of the Avalanche Center. Check out the website for details.

Avalanche Danger Scale

Back to the Yellowstone Daily Winter Reports or the Yellowstone Weather Page

Information provided by Yellowstone National Park, National Weather Service and Gallatin National Forest Avalanche Center

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